A Nielsen Mobile Shopping Report looks at how consumers are using mobile devices throughout their purchase journey. In response to a survey question about shopping, 27% of tablet owners said they use mobile devices for payment, 21% said they use such devices to make social media comments about their purchases, and 10% said they use such devices to retrieve mobile coupons. Suppose the results are based on a survey of 300 tablet own-ers. Construct a 95% confidence interval estimate of the population proportion of tablet owners who said they use their mobile device while shopping
a. For payment.
b. To make social media comments about their purchases.
c. To retrieve mobile coupons.
d. You have been asked to update the results of this study. Determine the sample size necessary to estimate, with 95% confidence, the population proportions in (a) through (c) to within ± 0.02.